5(I). f(t), P(t) Q(t).
f(t)
f(t) , Dt0,
*
- (2)
**
(*) (**), , (11)
P(t)=1-Q(t) (12)
27. λ(t), f(t) () P(t); Q(t).
P(t) () Q(t)
l(t)
, ,
(*)
N(t) N(t)=N(0)-N(0)Q(t)=N(0)(1-Q(t))=N(0)P(t) (**)
(**) (*)
(15)
(15) - , f(t),
(16)
(16) , .. P(t)£ 1
28. λ(t) P(t).
P(t)
(**)
(**) 0 t
x=P(t), , P(0)=1, ln 1 = 0, (e0=1),
1- |
(17)
,
, , (17)
(18)